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#pragma once
#include <concepts>
#pragma comment(lib, "advapi32.lib")
#include <string>
#include <string_view>
#include <Windows.h>
namespace OpenVic::Windows {
inline std::wstring convert(std::string_view as) {
// deal with trivial case of empty string
if (as.empty()) {
return std::wstring();
}
// determine required length of new string
size_t length = ::MultiByteToWideChar(CP_UTF8, 0, as.data(), (int)as.length(), 0, 0);
// construct new string of required length
std::wstring ret(length, L'\0');
// convert old string to new string
::MultiByteToWideChar(CP_UTF8, 0, as.data(), (int)as.length(), &ret[0], (int)ret.length());
// return new string ( compiler should optimize this away )
return ret;
}
inline std::string convert(std::wstring_view as) {
// deal with trivial case of empty string
if (as.empty()) {
return std::string();
}
// determine required length of new string
size_t length = ::WideCharToMultiByte(CP_UTF8, 0, as.data(), (int)as.length(), 0, 0, NULL, NULL);
// construct new string of required length
std::string ret(length, '\0');
// convert old string to new string
::WideCharToMultiByte(CP_UTF8, 0, as.data(), (int)as.length(), &ret[0], (int)ret.length(), NULL, NULL);
// return new string ( compiler should optimize this away )
return ret;
}
template<typename T, typename... U>
concept any_of = (std::same_as<T, U> || ...);
template<typename T>
concept either_char_type = any_of<T, char, wchar_t>;
template<typename T>
concept has_data = requires(T t) {
{
t.data()
}
-> std::convertible_to<const typename T::value_type*>;
};
class RegistryKey {
public:
RegistryKey(HKEY key_handle)
: _key_handle(key_handle) {
}
template<either_char_type CHAR_T, either_char_type CHAR_T2>
RegistryKey(HKEY parent_key_handle,
std::basic_string_view<CHAR_T> child_key_name,
std::basic_string_view<CHAR_T2> value_name) {
open_key(parent_key_handle, child_key_name);
query_key(value_name);
}
~RegistryKey() {
close_key();
}
bool is_open() const {
return _key_handle != nullptr;
}
std::wstring_view value() const {
return _value;
}
template<either_char_type CHAR_T>
LSTATUS open_key(HKEY parent_key_handle, std::basic_string_view<CHAR_T> key_path) {
if (is_open()) {
close_key();
}
if constexpr (std::is_same_v<CHAR_T, char>) {
return RegOpenKeyExW(parent_key_handle, convert(key_path).data(), REG_NONE, KEY_READ, &_key_handle);
} else {
return RegOpenKeyExW(parent_key_handle, key_path.data(), REG_NONE, KEY_READ, &_key_handle);
}
}
bool is_predefined() const {
return (_key_handle == HKEY_CURRENT_USER) ||
(_key_handle == HKEY_LOCAL_MACHINE) ||
(_key_handle == HKEY_CLASSES_ROOT) ||
(_key_handle == HKEY_CURRENT_CONFIG) ||
(_key_handle == HKEY_CURRENT_USER_LOCAL_SETTINGS) ||
(_key_handle == HKEY_PERFORMANCE_DATA) ||
(_key_handle == HKEY_PERFORMANCE_NLSTEXT) ||
(_key_handle == HKEY_PERFORMANCE_TEXT) ||
(_key_handle == HKEY_USERS);
}
LSTATUS close_key() {
if (!is_open() || is_predefined()) {
return ERROR_SUCCESS;
}
auto result = RegCloseKey(_key_handle);
_key_handle = nullptr;
return result;
}
template<either_char_type CHAR_T>
LSTATUS query_key(std::basic_string_view<CHAR_T> value_name) {
DWORD data_size;
DWORD type;
const auto& wide_value = [&value_name]() -> has_data auto {
if constexpr (std::is_same_v<CHAR_T, char>) {
return convert(value_name);
} else {
return value_name;
}
}();
auto result = RegQueryValueExW(_key_handle, wide_value.data(), NULL, &type, NULL, &data_size);
if (result != ERROR_SUCCESS || type != REG_SZ) {
close_key();
return result;
}
_value = std::wstring(data_size / sizeof(wchar_t), L'\0');
result = RegQueryValueExW(_key_handle, wide_value.data(), NULL, NULL, reinterpret_cast<LPBYTE>(_value.data()), &data_size);
close_key();
std::size_t first_null = _value.find_first_of(L'\0');
if (first_null != std::string::npos) {
_value.resize(first_null);
}
return result;
}
private:
HKEY _key_handle = nullptr;
std::wstring _value;
};
template<either_char_type RCHAR_T, either_char_type CHAR_T, either_char_type CHAR_T2>
std::basic_string<RCHAR_T> ReadRegValue(HKEY root, std::basic_string_view<CHAR_T> key, std::basic_string_view<CHAR_T2> name) {
RegistryKey registry_key(root, key, name);
if constexpr (std::is_same_v<RCHAR_T, char>) {
return convert(registry_key.value());
} else {
return registry_key.value();
}
}
template<either_char_type RCHAR_T, either_char_type CHAR_T, either_char_type CHAR_T2>
std::basic_string<RCHAR_T> ReadRegValue(HKEY root, const CHAR_T* key, const CHAR_T2* name) {
auto key_sv = std::basic_string_view(key);
auto name_sv = std::basic_string_view(name);
return ReadRegValue<RCHAR_T>(root, key_sv, name_sv);
}
}
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